Supergravity effects on flame propagation and structure in hydrogen/air mixtures
梁文恺 1罗忠敬1
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作者信息
1. Center for Combustion Energy,Department of Energy and Power Engineering,Tsinghua University,Beijing 100080,China;Department of Mechanical and Aerospace Engineering,Princeton University,Princeton 08544,USA
In the current work,we investigated hydrogen/air flame propagation under supergravity conditions.Results show that when gravity is in the same/opposite direction as flame propagation,it leads to acceleration/deceleration of the flame,and that such an effect could substantially modify the flame propagation and structure at high gravity levels.Furthermore,for the absolute and relative flame propagation speeds,the gravity-affected flame speed shows opposite trends as the absolute flame speed is more affected by the local induced flow field,while the relative flame speeds are controlled by the super-adiabatic or sub-adiabatic flame temperature.The gravity-affected thermal and chemical flame structures are also examined through the influence of the mixture equivalence ratio,pressure,and flame stretch.
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